diff --git a/src/dockerproxy.js b/src/dockerproxy.js
index 1b26285e0..25cf61ae6 100644
--- a/src/dockerproxy.js
+++ b/src/dockerproxy.js
@@ -31,8 +31,7 @@ async function authorizeApp(req, res, next) {
     const [error, app] = await safe(apps.getByIpAddress(req.connection.remoteAddress));
     if (error) return next(new HttpError(500, error));
     if (!app) return next(new HttpError(401, 'Unauthorized'));
-
-    if (!('docker' in app.manifest.addons)) return next(new HttpError(401, 'Unauthorized'));
+    if (app.manifest.addons?.docker) return next(new HttpError(401, 'Unauthorized'));
 
     req.app = app;
 
@@ -73,8 +72,8 @@ function containersCreate(req, res, next) {
 
     debug('Original bind mounts:', req.body.HostConfig.Binds);
 
-    let binds = [];
-    for (let bind of (req.body.HostConfig.Binds || [])) {
+    const binds = [];
+    for (const bind of (req.body.HostConfig.Binds || [])) {
         if (!bind.startsWith('/app/data/')) {
             req.dockerRequest.abort();
             return next(new HttpError(400, 'Binds must be under /app/data/'));
@@ -86,8 +85,7 @@ function containersCreate(req, res, next) {
     debug('Rewritten bind mounts:', binds);
     safe.set(req.body, 'HostConfig.Binds', binds);
 
-    let plainBody = JSON.stringify(req.body);
-
+    const plainBody = JSON.stringify(req.body);
     req.dockerRequest.setHeader('Content-Length', Buffer.byteLength(plainBody));
     req.dockerRequest.end(plainBody);
 }
@@ -96,7 +94,7 @@ function containersCreate(req, res, next) {
 function process(req, res, next) {
     // we have to rebuild the body since we consumed in in the parser
     if (Object.keys(req.body).length !== 0) {
-        let plainBody = JSON.stringify(req.body);
+        const plainBody = JSON.stringify(req.body);
         req.dockerRequest.setHeader('Content-Length', Buffer.byteLength(plainBody));
         req.dockerRequest.end(plainBody);
     } else if (!req.readable) {
@@ -151,7 +149,7 @@ async function start() {
 
             if (req.headers['content-type'] === 'application/json') {
                 // TODO we have to parse the immediate upgrade request body, but I don't know how
-                let plainBody = '{"Detach":false,"Tty":false}\r\n';
+                const plainBody = '{"Detach":false,"Tty":false}\r\n';
                 upgradeMessage += 'Content-Type: application/json\r\n';
                 upgradeMessage += `Content-Length: ${Buffer.byteLength(plainBody)}\r\n`;
                 upgradeMessage += '\r\n';